presidential debate. elizabeth explains now why both men are approaching it with cautious optimism. >> president baa rack obama and governor mitt romney their first of three show downs. this week the debate will focus on domestic policy with a heavy emphasis on the economy. romney says it's not about who comes out on top. >> in my view it's not so much winning or losing or even the people themselves, the president and myself, it's about something bigger than that. these debates are an opportunity for each of us to de scribe the bathway forward for america that we would choose. >> while the president is confident he's not underestimating the competition. >> gofrper romney, he's a good debater. i'm just okay. >> romney may have an advantage. during the primaries, he participated in several debates. this time around he's been gearing up for one-on-one face offs. >> just getting used and tarlying the questions back and forth how the single moderator is going to be controlling the debate between two candidates